Why do we feel sleepy in spring?

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Tags

  1. #buster
  2. #sleep
  3. #apparently
  4. #caused
  5. #happiness
  6. #hormone
  7. #stress
  8. #drowsiness
  9. #symptom
  10. #during
  11. #serotonin
  12. #system
  13. #hormones
  14. #springtime
  15. #daylight
  16. #natural
  17. #shorter
  18. #tired
  19. #physical
  20. #produces
  21. #winter
  22. #booster
  23. #hours
  24. #melatonin